Sas Z, Somlai J, Szeiler G, Kovács T
University of Pannonia, Institute of Radiochemistry and Radioecology, PO Box 158, Veszprém, H-8201, Hungary.
Radiat Prot Dosimetry. 2012 Nov;152(1-3):51-4. doi: 10.1093/rpd/ncs191. Epub 2012 Aug 22.
The exhaled radon originated from building materials corresponds to the indoor radon activity concentration. One of the most commonly used building materials is the brick made from clay by heat treatment. In this study, the radon emanation and radon exhalation features of clay samples are presented as a function of heat applied (100-950°C). The free radon exhalation was determined with the help of radon accumulation kit. The initial radon exhalation value continuously reduced owing to the increased temperature. In the case of the highest temperature treated sample, the measured exhalation was <1 % of the original. The tendency of the loss relates to the internal structure modification, which was also investigated (porosity, specific surface and superficial morphology by environmental scanning electron microscope snapshots). On the basis of the obtained result, it can be safely stated that strong correlation can be observed between the internal structural changes and the found exhalation profile.
建筑材料中释放的氡与室内氡活度浓度相对应。最常用的建筑材料之一是通过热处理由粘土制成的砖。在本研究中，给出了粘土样品的氡析出和氡释放特性随施加热量（100 - 950°C）的变化情况。借助氡积累套件测定了自由氡释放量。由于温度升高，初始氡释放值持续降低。对于经过最高温度处理的样品，测得的释放量小于原始值的1%。损失趋势与内部结构变化有关，对此也进行了研究（通过环境扫描电子显微镜快照观察孔隙率、比表面积和表面形态）。根据所得结果，可以有把握地说，内部结构变化与所发现的释放曲线之间存在很强的相关性。
